Regular audits and internal company standards

All corporate processes at Liebherr are focussed on quality, from the selection of raw materials and suppliers to the after-sales service. Each individual component of the large diameter slewing bearing is subject to strict quality requirements. This is why we only work with select suppliers, who are audited on a regular basis. Internal company standards apply to certain raw materials like rolled steel rings. These standards contain requirements, which go beyond the common industry standards.

Sophisticated quality management

Liebherr bearings are characterised by their high quality and reliability. In order to guarantee and further improve our quality standard over the long term, we document all manufacturing and assembly processes in a production data acquisition system. This also serves as a central quality management system for production and assembly measurements, thus allowing comprehensive control, monitoring and tracking; deviations are quickly eliminated and processes are constantly optimised.

Approved quality: certifications

The numerous certifications are testament to Liebherr's high standard of quality. Aside from the usual ISO standards of the quality management system, Liebherr has the following certifications:

  • DIN EN ISO 9001:2015
    This norm forms the basis for our QA system and the ongoing improvement process within the company Liebherr-Components Biberach GmbH for the business unit slewing bearings.
  • EN 1090-2:2008+A1:2011; EXC3 in accordance with EN 1090-2
    This certification qualifies us to weld and produce steel support structures. These serve, for example, as earthquake protection in nuclear power stations.

Ultramodern measurement methods

Liebherr not only makes regular use of traditional computer-aided measurement methods. The Liebherr Group also possesses numerous highly specialised measuring devices. In recent years, for example, the company has invested in a state-of-the-art crack detection system using high frequency magnetisation and a fully climate-controlled large diameter bearing measuring chamber. 3D measurements of slewing rings with a diameter up to 6,000 mm can be effected. This type of measurement is unique worldwide.

Seamless quality management

  • Magnetic particle and ultrasonic measurement

    Quality control for Liebherr slewing bearings

    Magnetic particle and ultrasonic measurement

  • Hardness measurement

    Quality control for Liebherr slewing bearings

    Hardness measurement

  • Measurement of hardness depth

    Quality control for Liebherr slewing bearings

    Measurement of hardness depth

  • Surface inspection (surface roughness)

    Quality control for Liebherr slewing bearings

    Surface inspection (surface roughness)

  • Dimension checks and visual inspection

    Quality control for Liebherr slewing bearings

    Dimension checks and visual inspection

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    Engineering expertise

    During the design and development of high quality gearbox solutions, Liebherr relies on state-of-the-art development and calculation methods. Engineering for drives